Design and analysis of digital audio amplifier using ZVS PWM converter

Author

Lau, W.H. ; Chung, Henry S H ; Wu, C.M. ; Poon, N.K.

Author_Institution

Dept. of Electron. Eng., Hong Kong Polytech., Kowloon, Hong Kong

Volume

5

fYear

1999

fDate

1999

Firstpage

218

Abstract

This paper presents a simple methodology to convert a hard-switched pulse-width-modulated (PWM) H-bridge converter used in classical digital audio amplifiers into a zero-voltage-switching (ZVS) converter. ZVS is simply achieved by connecting an L-C series branch across the converter output. ZVS occurs during the dead time interval of the PWM signals, giving an effective improvement in the conversion efficiency, output frequency spectrum, and total harmonic distortion (THD). Simplified design procedures are given for choosing the value of the components. A prototype having output power of 20 W and with switching frequency of 705.6 kHz has been built and the experimental results are presented

Keywords

PWM power convertors; audio-frequency amplifiers; bridge circuits; harmonic distortion; switching circuits; 20 W; 705.6 kHz; H-bridge converter; L-C series branch; ZVS PWM converter; conversion efficiency; dead time interval; design procedures; digital audio amplifier; output frequency spectrum; output power; switching frequency; total harmonic distortion; Frequency conversion; Joining processes; Power generation; Prototypes; Pulse amplifiers; Pulse width modulation; Pulse width modulation converters; Switching frequency; Total harmonic distortion; Zero voltage switching;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 1999. ISCAS '99. Proceedings of the 1999 IEEE International Symposium on

Conference_Location

Orlando, FL

Print_ISBN

0-7803-5471-0

Type

conf

DOI

10.1109/ISCAS.1999.777549

Filename

777549